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(FIXED_REGNO_P): Remove previous change; all callers but one already check. 

(CHEAP_REG): Only call FIXED_REGNO_P for hard regs.
(fold_rtx): Clarify comments.

From-SVN: r3762
This commit is contained in:
Richard Kenner 1993-03-16 17:41:57 -05:00
parent 0a7b7709eb
commit e7bb59fa6c
1 changed files with 7 additions and 10 deletions
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17
gcc/cse.c
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@ -438,13 +438,11 @@ struct table_elt
but not if it is an overlapping register. */
#ifdef OVERLAPPING_REGNO_P
#define FIXED_REGNO_P(N) \
(((N) == FRAME_POINTER_REGNUM \
|| ((N) < FIRST_PSEUDO_REGISTER && fixed_regs[N])) \
(((N) == FRAME_POINTER_REGNUM || fixed_regs[N]) \
&& ! OVERLAPPING_REGNO_P ((N)))
#else
#define FIXED_REGNO_P(N) \
((N) == FRAME_POINTER_REGNUM \
|| ((N) < FIRST_PSEUDO_REGISTER && fixed_regs[N]))
((N) == FRAME_POINTER_REGNUM || fixed_regs[N])
#endif
/* Compute cost of X, as stored in the `cost' field of a table_elt. Fixed
@ -456,7 +454,8 @@ struct table_elt
((N) == FRAME_POINTER_REGNUM || (N) == STACK_POINTER_REGNUM \
|| (N) == ARG_POINTER_REGNUM \
|| (N) >= FIRST_VIRTUAL_REGISTER && (N) <= LAST_VIRTUAL_REGISTER \
|| (FIXED_REGNO_P (N) && REGNO_REG_CLASS (N) != NO_REGS))
|| ((N) < FIRST_PSEUDO_REGISTER \
&& FIXED_REGNO_P (N) && REGNO_REG_CLASS (N) != NO_REGS))
#define COST(X) \
(GET_CODE (X) == REG \
@ -4474,11 +4473,9 @@ simplify_ternary_operation (code, mode, op0_mode, op0, op1, op2)
Otherwise, return X, possibly with one or more operands
modified by recursive calls to this function.
If X is a register whose contents are known, we may or may not
return those contents. An instruction that uses a register is usually
faster than one that uses a constant. But on machines with few hard
regs, using a register instead of a constant increases register life,
hurting register allocation.
If X is a register whose contents are known, we do NOT
return those contents here. equiv_constant is called to
perform that task.
INSN is the insn that we may be modifying. If it is 0, make a copy
of X before modifying it. */